Guildayichthyidae

Guildayichthyidae is a prehistoric family of marine fish from the Mississippian Bear Gulch Limestone of Montana. It is the only family in the order Guildayichthyiformes. Guildayichthyids possess an uncommon mixture of primitive and modern characteristics in their skull bones.

Taxonomy
This family consists of the following genera and species:


 * Genus Guildayichthys Lund, 2000
 * Species Guildayichthys carnegiei Lund, 2000
 * Genus Discoserra Lund, 2000
 * Species Discoserra pectinodon Lund, 2000